Piston.



F. G. HAAS.

PISTON.

APPLICATION FILED JULY 29,1912.

Patefiteol Apr. 14,1914.

, INVENTOR. FERDINAND. G. HAAS.

WITNESSES:

A TTORN E Y.

FERDINAND G. HAAS, 0F STiPAUL, MINNESOTA.

PIS TON. I

Specification of Letters Patent. Patented Apr. 14L, 1914i.

Application filed July 29, 1912. Serial No. 712,056.

, pistons.

My object is to provide aneflicient piston readily adjustable to take up wear and also adapted to fit cylinders of different diameters by a mere substitution of sleeves of varying thickness.

My piston is designed for use on either steam or gas engines, hydraulic presses, am-

. monia and air compressors and all other engines requiring a tight-fitting piston.

In the accompanying drawings, Figure 1 is a central longitudinal section of my piston; Fig. '2 is a plan view thereof; Fig. 3 is a detail showing my compression member and Figs. 4 and 5 are details of the washer and nut respectively used on said compression screw.

The piston proper is composed of three parts, viz., the head 2 and the sleeves 3 and 4:, which are adapted to snugly surround the head and to fit tightl into a cylinder of ordinary construction. gaid sleeves may be formed with grooves 4: to receive ordinary elastic metal piston rings. Inorder to adapt this composite cylinder for the uses proposed, it is formed with annular spaces between the sleeves 3 and'l and between the sleeve 4 and the flange 5 on the end of the piston head. These annular spaces are filled by resilient packin rings 6 and 6, which are adapted upon t e application of lateral pressure to expand radially. I prefer to make these rings of a composition of asbestosand graphite. I

In the end of the head 2, opposite to the flange 5, threaded perforations are formed adapted to receive the compression screws 8 which are formed with enlargements or shoulders 9, are furnished with washers 10 and held in place by set nuts 11. The head 2 and sleeve 3 are bored or reamed at 12 to receive the shoulders 9 on the compression screws 8, such bore in the head being of a greater depth than that in the sleeve 3.

It will thus be seen that when the compression screws are turned into the perforations 7, the shoulders 9 are advanced into the bored out portion of the head and force the sleeve 3 down upon the packing ring 6, thereby expanding said ring radially and causing the same to move the sleeve 4 for-' Ward upon the second packing ring 6, which in turn is compressed laterally against the fiange 5 and expanded radially. When the compression screws have been suf ficiently advanced to properly adjust the packing rings in the cylinder, the set nuts 11 are screwed down to maintain the entire structure in adjusted position.

Should the parts become worn they may be refitted to each other by further advancing the compression screws and set nuts. The piston may also be adjusted to cylinders of varying diameter by substituting for the sleeves 3 and 4 others of greater or less thickness. A single sleeve and packing ring may sometimes suifice.

Having described my invention, What I claim as new and desire to protect by Letters Patent is:

1. A piston head having a plurality of peripheral piston sleeves slidable longitudinally thereon, resilient packing rings between said piston sleeves and a plurality of compression members on said piston head in operative engagement with one of saidsleeves for shifting the sleeves and thereby expanding said rings radially.

2. A piston head formed with an external annular flange a peripheral piston sleeve slidable on said head, said sleeve being formed with annular grooves to receive piston rings, a resilient packing ring between said sleeve and flange and a plurality of compression devices on said head in operative engagement with said sleeve to shift I a the same and thereby expand said resilient packing ring radially.

3. A-piston head havlnga lurahty of peripheral piston sleeves sllda le longitudinally thereon, resilient packm ringsbetween said piston sleeves, a p urallty of screws threaded longitudinally into the end name to this specification in the presence of of said head and extending outwardly theretwo subscribing witnesses.

from, devices on said screws to engage one of said sleeves and locking means for said FERDINAND HAAS' 5 screws, both the screws and locking means -Witnesses:

being accessible from the end of the piston. F. M. HARDY,

In testimony whereof, I have signed my F. C..CAsW1-:LL. 

